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HeliHobby . Ron’s HeliProz South . Century Helicopter

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Henseleit 3DNT - Rocket - 3DMP > Just ordered a 3DNT
 
 
Arief
Heliman
Location: Adelaide, AUSTRALIA

Hi folks, I just ordered a 3DNT from Stephen (Cyber-Heli) a few days ago.... Don't know what I'm getting myself into, to be honest. I have very little experience tuning engine,... the only one I tried to tune was for my Raptor 30, a few months later converted it into electric power. (All my heli and planes + jet are electric powered)

I'm no means a 3D flyer but the heli looks so coool, just can't resist getting one.
01-06-2004 Over year old.
 
 
Darren Bradley
Veteran
Location: UK

Welcome ...

You have got yourself into one hell of a heli , thats what .. Dont worry to much about the engine etc .. Just post on here if you have any problems.
01-06-2004 Over year old.
 
 
drkite
Heliman
Location: Ulm/Germany

Hi Arief,

you certainly did it right!

I went a similar path. Two years ago I started flying rc-helis with an electric Logo10. Than I changed to Graupner Uni2000 .60 heli, but this was just for two or three months. The Uni did not fly and react as I wanted it.

Than I fell in love with the 3DNT for similar reasons as you: the construction is simply genius and there is not a single unnecessary part on it. Weight is very low (4.5kg) and you can vary headspeed between 1300 and 2000 rpm. And if you use the recommended Loetterle carb, you can fly with 0% nitro (which is somehow important in Germany, as nitro is expensive).

Unfortunately the assembly time was much too short - I only needed three days :-). For the first maiden flight I used 30% expo, but right on the 3rd or 4th flight I changed back to 0. Now I have got two of them and I have learned looping and backward flying with the NT. Again, similar as you, I am not in 3d (yet), but the NT has every potential you would need.

I was flying once at our local spot when an elderly couple came by and watched me flying the NT. After I landed the woman asked me: "I saw the smoke on the model - is this an engine or is it electric?" Initially I tented to answer "No, it is solar", but then I just told her that is is indeed a combustion engine.

You WILL love your 3DNT!!

No need to worry about tuning the engine. If you use the OS with a Loetterle carb, the instructions are very clear and simple, and once you have the engine running right, there is hardly any occasion where you have to tune it differently.

Bernhard
01-07-2004 Over year old.
HOMEPAGE  
 
 
Arief
Heliman
Location: Adelaide, AUSTRALIA

I'm almost finished building the NT. Trying to juggle it with moving house and the birth of our new daughter.
I have a few question though, being the only IC engine I've got in the hanger.
1. I 've got the Webra combo- Do I use straight fuel (12 % oil and no nitro)?
2. How much gap should there be between the hatori pipe and the header pipe?
3. Where the heck do you plug in those fuel tubes to (from the tank). I know one goes to the engine, the other goes to the pipe, the 3rd?
02-03-2004 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

3rd is a filler pipe...

To fill the tank you clamp the carb line and fill thru the third line



Don't Email me as I wont reply - PM Only (spam countermeasures)
02-03-2004 Over year old.
 
 
Pascal
Senior Heliman
Location: Paris, France

Arief,


Get the help of Dude for the webra.
Running in this engine properly is the key of your success or failure with this engine. It will require a minimum of 4 gallons to achieve it.

What carburator do you have on this engine, the original webra one or a Lotterle ?

Pascal
02-03-2004 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Gregory

Have you had any problems in fast piros with the motor breaking rich since switching to 15%?

Thanks in advance



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02-03-2004 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Okay thanks for that, did you need to modify anything to get the webra to fit, ie engine mounts, fan etc?



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02-03-2004 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Thanks gregory, will PM you my email address

My Engine should arrive from CH tomorrow as its made it thru customs now after 5 days Didnt get stephen to run mine in as I enjoy that part of the job, and it encourages me to run it gently whilst I am getting used to it..

Regards


Mark



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02-03-2004 Over year old.
 
 
Arief
Heliman
Location: Adelaide, AUSTRALIA

So 15 % oil and no nitro ? What about the gap between the tune pipe and the header (for webra) . ?
02-04-2004 Over year old.
 
 
Pascal
Senior Heliman
Location: Paris, France

Arief,


Actually, Gregory was using CP 12.5% and has switched lately to CP15%, still using an Enya4.
The original carburator of the webra is not designed for low nitro % and only12% of synthetic oil.

About the pipe, the original setting is a bit on the long side BUT do not try to shorter your pipe until you have burned 5 gallons of fuel and stay tuned too rich during this period.

Pascal
02-04-2004 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

My Webra arrived today and has been fitted without too many problems...

Had to shim the engine mounts (as it was tight on the crankcase) and also bore the fan out as the Webra has a thicker thread portion than the OS...

Fired her up this afternoon and she ran nice once I had started to richen the MC carb... Adjusting the mixture from your TX is just sooooo coool...

My only issue thus far is the servo I am using to control the mixture... gonna get me a Volz Micro digital which should give me the resolution I need for accurate mixture.. Avoids me having to allow for the dodgy pot in this hitec and running it over rich all the while...

Will report further once I have given her a fly at the weekend and then again when the webra is run in.... 4 gallons



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02-04-2004 Over year old.
 
 
BigChopper
Key Veteran
Location: Cambridge, UK

webra

Mark,

I've got my webra running fine on 5% now and I can't notice any difference in power to when it was on 15%..

I think with this engine: more nitro = more wasted money!

I had the problem with it breaking rich in fast piros.. But after I leaned it out a little, and on a TJ pro, it seems ok.

Andy
02-05-2004 Over year old.
HOMEPAGE  
 
 
Arief
Heliman
Location: Adelaide, AUSTRALIA

pipe length

Guys I reaaly need your help. Since I have no experience in IC engine. How the heck do you measure the pipe length. I know that the hatori with webra engine needs about 440mm, but how do u measure this? From the end of the exhaust to the end of the header? I heard something about the first baffle, to the header (But where on the hatori pipe is the first baffle) does anyone have a picture.

Sorry about this... sounds rather silly , but I honestly have no clue.
02-05-2004 Over year old.
 
 
Darren Bradley
Veteran
Location: UK

The pipe length is from the end of the manifold to the start of the pipe. In the kit you are supplied with a 50mm tube, and in the manual for the NT for the OS91 , the distance is 2-3 mm ..
Not tried the webra though .. sorry
02-05-2004 Over year old.
 
 
Pascal
Senior Heliman
Location: Paris, France

The lenght should be measured from the exhaust opening of the cylinder to the first baffle.

Take a piece of carbon tube or any rigid tube of small diameter, enter it in the tune pipe, you will find quickly the baffle, then you can measure the lenght of the tube..

For the webra, you will have to shorten something, pipe or manifold, I would recommend not to do it before your burn at least 4 gallons.
When you will do it, remove 5mm at a time no more. The 440mm is just an indication, and measuring the lenght of the manifold with its curves is by far not an exact indication.

Having the pipe tuned too short is a sure disaster...

Pascal
02-05-2004 Over year old.
 
 
iachia
Veteran
Location: Milan, Italy

Galifrey,
make sure you use the same servos for the mixture and the throttle otherwise you won't have a proper engine response.
they have to be at least of the same speed and use the same distance on the servo horns.
bye

_____________
Synergy N9
02-05-2004 Over year old.
HOMEPAGE  
 
 
Arief
Heliman
Location: Adelaide, AUSTRALIA

Thank you so much for clearing this up for me Pascal. Won't be cutting anything yet, just needed a starting point.
02-05-2004 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Thanks iachia

I am using very similar speed servos and a 1:1 servo/bellcrank ratio on the air and fuel mixtures...

The only difference is one is full size and one is micro, both using futaba servo horns...

Andy

as always your help is appreciated...



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02-05-2004 Over year old.
 
 
iachia
Veteran
Location: Milan, Italy

Well, it's true that the mixture servo travel is shorter than the throttle sevo but it's also true that when you're in idl up neither of the two is much: i.e. your throttle will go from 65 to 100% and you mixture form 45 to 80% more or less.
In this situation it's important that both the mixture servo and the throttle servo arrive to the desired position at the same time and the only way to do this is with 2 servos wich have the same speed and the same distance on the servo horn.
At the beginning I had your same doubt about the need of this setup but I found you really need to do this if you want a good engine response!

_____________
Synergy N9
02-05-2004 Over year old.
HOMEPAGE  
 
 
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Henseleit 3DNT - Rocket - 3DMP > Just ordered a 3DNT
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